SfePy

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ANN: SfePy 2022.2
by Robert Cimrman 29 Jun '22

29 Jun '22

I am pleased to announce the release of SfePy 2022.2. Description ----------- SfePy (simple finite elements in Python) is a software for solving systems of coupled partial differential equations by finite element methods. It is distributed under the new BSD license. Home page: https://sfepy.org Mailing list: https://mail.python.org/mm3/mailman3/lists/sfepy.python.org/ Git (source) repository, issue tracker: https://github.com/sfepy/sfepy Highlights of this release -------------------------- - custom testing code replaced by pytest - improved pyvista-based visualization script For full release notes see [1]. Cheers, Robert Cimrman [1] http://docs.sfepy.org/doc/release_notes.html#id1 --- Contributors to this release in alphabetical order: Robert Cimrman Jan Heczko Vladimir Lukes

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Re: [sfepy-devel] Re: 1D line elements in SfePy
by Samuel Udelman 28 Jun '22

28 Jun '22

Hi Robert, Are there any updates on this topic? Do you have any recommendations to deal with beam and shell elements in 3D space? Cheers -- Samuel Udelman M +34 681 334 754 Skype: sbudelman samueludelman(a)gmail.com

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Nodal sets and groups
by Jan Heczko 17 Jun '22

17 Jun '22

Hi, everyone, I tried to define the regions for my BCs using nodal sets, i.e. I would like to select different portions of the surface of my domain. I was almost able to do it using nodal sets in the Abaqus (.inp) mesh format. Here is my testing file: *HEADING Abaqus DataFile Version 6.14 written by meshio v5.3.0 *NODE 1, 0.0000000000000000e+00, 0.0000000000000000e+00, 0.0000000000000000e+00 2, 1.0000000000000000e+00, 0.0000000000000000e+00, 0.0000000000000000e+00 3, 0.0000000000000000e+00, 1.0000000000000000e+00, 0.0000000000000000e+00 4, 1.0000000000000000e+00, 1.0000000000000000e+00, 0.0000000000000000e+00 5, 0.0000000000000000e+00, 0.0000000000000000e+00, 1.0000000000000000e+00 6, 1.0000000000000000e+00, 0.0000000000000000e+00, 1.0000000000000000e+00 7, 0.0000000000000000e+00, 1.0000000000000000e+00, 1.0000000000000000e+00 8, 1.0000000000000000e+00, 1.0000000000000000e+00, 1.0000000000000000e+00 *ELEMENT, TYPE=C3D8RH 1,1,2,4,3,5,6,8,7 *NSET, NSET=1 5,6,7,8 *NSET, NSET=0 1,2,3,4,5,6,7,8 Now if I try to define a region by 'vertices of set 1' I get 'ValueError: undefined vertex set! (1)'. It seems to me that only some previously defined regions are considered in this case. If I define it by 'vertices of group 0', the regions are defined without an error, but do not contain the correct vertices (top: [4 5 6 7], bottom: [0 1 2 3] - i.e. four nodes are missing from the `bottom` region). I traced this down to `MeshioLibIO.read` (lines 385-394), where sets (`m.point_sets`, which contain the correct nodes) are converted into groups (`ngroups`, only one group per node). Is there some way how to make this work? Thanks, Jan

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Suscription
by J. Sanz 07 Jun '22

07 Jun '22

Hello, I would like to get into the sfepy team. Best regards, J Sanz

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Python
by Stacey High 03 Jun '22

03 Jun '22

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Re-assemble only certain terms of an equation
by hugo.levy＠gmail.com 18 May '22

18 May '22

Hi Robert, I am currently facing a new difficulty using Sfepy for solving nonlinear PDEs. I have coded my own Newton’s iterative method that simply consists in linearizing the PDE F(u)=0 around the previous iteration u_k. I have two questions: 1) At each iteration, I create a `Problem` instance for the linearized PDE and solve it the usual way in Sfepy. However, only the “linearized-nonlinear” terms need to be recomputed from one iteration to another. For the sake of computational efficiency, I wish not to reconstruct all matrices / rhs vectors but only the ones that need to be updated. How would you achieve that? In other words, how can you store some assembled terms while re-assembling some others? 2) For some reason, I need to evaluate another function, say G (a residual), at each iteration in the weak form. Again, some terms in G are constant while others are iteration-dependent (through their material). How would you efficiently evaluate G(u_k) at each iteration? Currently, the only way I found is to do dummy_ts = TimeStepper(0, 100) # ficticious time-stepper eqs = Equations([my_equation]) # equation associated with function G eqs.init_state() ebcs = Conditions(my_ebcs) epbcs = Conditions(my_epbcs) eqs.time_update(dummy_ts, ebcs=ebcs, epbcs=epbcs) res_vec = eqs.eval_residuals(sol) # sol is the solution at current iteration which I guess this is not Sfepy’s philosophy… I hope my questions are clear enough. Thank you very much in advance for your help. Best regards, Hugo L.

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Material Parameters of Individual Nodes
by derj...＠web.de 12 Apr '22

12 Apr '22

Hello! It's a great tool you built there! I'd like to use it for some kind of topology optimisation. Is there an "idiomatic" way to set the material parameters of individual nodes? Thank you very much! JonnyB

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ANN: SfePy 2022.1
by Robert Cimrman 30 Mar '22

30 Mar '22

I am pleased to announce the release of SfePy 2022.1. Description ----------- SfePy (simple finite elements in Python) is a software for solving systems of coupled partial differential equations by finite element methods. It is distributed under the new BSD license. Home page: https://sfepy.org Mailing list: https://mail.python.org/mm3/mailman3/lists/sfepy.python.org/ Git (source) repository, issue tracker: https://github.com/sfepy/sfepy Highlights of this release -------------------------- - new handling of state variables data and State class removal - many new sensitivity analysis terms based on multi-linear term implementation For full release notes see [1]. Cheers, Robert Cimrman [1] http://docs.sfepy.org/doc/release_notes.html#id1 --- Contributors to this release in alphabetical order: Robert Cimrman Robert T. McGibbon Vladimir Lukes

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"sudo apt-get install python-sfepy" doesn't works in Ubuntu 20.04
by Martin Alberto Díaz Viera 14 Mar '22

14 Mar '22

Would you please help me? I would like to install sfepy in Ubuntu 20.04, but using "sudo apt-get install python-sfepy" yields: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package python-sfepy What am I doing wrong? Best, Martin

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Puzzle
by 979439736＠qq.com 01 Mar '22

01 Mar '22

hello， Can you tell me which part of the code in sfepy specifically calculates the element stiffness matrix? Which textbook do you refer to for the method of calculating the element stiffness matrix? Thanks!

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